USA Question regarding multiple performance obligations

[Carly Schank]

Let's say company A is selling company B an assembly line system made up of 3 different segments and has promised to install it. All three segments are required for the assembly line to work and are rarely bought separately, and there is a cost for the installation service. Company A does not offer the installation service separately (so it's only offered if you buy the assembly line) but you can choose to have a 3rd party install it instead. Is there only one performance obligation here? Or is the installation considered distinct?

Thanks for the help.